[clang] [clang] ASTContext: flesh out implementation of getCommonNNS (PR #131964)

[Erich Keane via cfe-commits]

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@@ -13462,13 +13462,114 @@ static ElaboratedTypeKeyword getCommonTypeKeyword(const T *X, const T *Y) {
                                             : ElaboratedTypeKeyword::None;
 }
 
+static NestedNameSpecifier *getCommonNNS(ASTContext &Ctx,
+                                         NestedNameSpecifier *X,
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erichkeane wrote:

X and Y are getting confusing as names when reviewing this :/  I know it isn't LHS and RHS, but even something that shows a bit more context (FirstNNS, SecondNNS, NNS1, NNS2, etc) would be helpful for reviewing/reading.

https://github.com/llvm/llvm-project/pull/131964